Jack-operating attachment.



J. L. DOWNS.

JACK OPERATING ATTACHMENT.

APPLICATION FILED AUG.8. 19!]- 1,244,964. Patented 001;. 30, 1917.

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F W ATTORNEYS UNTTE JAMES L. DOWNS, OF NEW YORK, N. Y.

JACK-OPERATING .ATTAGHMENT.

Specificationof Letterslatent.

. Patented Oct. so, 1917.

Application filed August 8, 1917. Serial No. 185,056.

To all hom may concern:

l lo it known that 1, JAMES L. DowNs a citizen of the {baited/States. and a resident of the city of New York. borough of the Bronx, county of the Bronx, and State of Xew York, have invent-ed a new and Improved Jack-Operating Attachment, of which the following is a. full, clear, and exact description.

This invention relates to lifting jacks of that type in which the movable loadcarr ving element is actuated by a rotary shaft operatively connected with the said element, and the invention deals particularly with an attachment for operating the said shaft with less applied power and greater case on the part of the operator and in a more comfortable position.

A more specific object of the inventionis the provision of an operating attachment in the form of a frame which is provided with a socketed shaft to fit the shaft of the jack, in combination with a gear on the frame to which an operating crank or motor is adapted to be connected, said frame having one end movably resting on the ground so as to assist in supporting the attachment in proper position.

With such objects in view, and others which will appear as the description pro ceeds, the invention comprises various novel features of construction and arrangement of parts which will be set forth with particularity in the following description and claims appended hereto.

In the accompany drawing, which illus trates certain embodiments of the invention and wherein similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a front view of a jack with the attachment applied thereto, a portion of the jack being shown in section;

Fig. 2 is a plan view of Fig. 1;

Fig. 3 is a fragmentary side view with a portion in section; and

Fig. i is a front view showing a modified form of attachment for lifting greater loads.

Referring to the drawing, A designates an ordinary lifting jack which has a horizontally extending operating shaft, the outer end of which is non-circular so as to permit a lever, wrench or operating crank to be ap plied thereto. This operating means is dispensed with and the attachment l3 substituted for operating the jack. This attachment comprises a frame 2 in the form of an arm which has the end 3 applied to the jack and the end resting on. the ground or other supporting surface at there being a roller 6 on the end t so as to allow the frame 2 to change its angle as the load-lifting element of the jack moves upwardly or downwardly.

In the frame B is a horizontal shaft 7 which has a socket 8 to receive the non-circular end 1 of the jack-operating shaft. This shaft 7 is journaled in bushings 9 mounted in the side members 10 of the arm or frame 2. Located between the side members 10 and keyed to the shaft 7 is a worm wheel 11 with which meshes a worm 12 that has journals 13 and 1% rotating in bearings 15 and 16, respectively. The journal 13 has a non-circular extension or shank 17 to which may be applied a crank or other operating device.

In the modification shown in Fig. 4 the shaft 72 corresponding to the shaft 7 of the other figures, has a gear wheel 18 which meshes with a pinion 19 connected with a worm wheel 9-0 that in turn meshes with the operating worm 12 By this construction a greater load can he lifted with the same applied power. In both forms of the invention the jack can be more conveniently operated and with less labor on the part of the user.

From the foregoing description taken in connection with the accompanying drawing, the advantages of the construction and method of operation will be readily under stood by those skilled in the art to which the invention appertains, and while I have described the principle of operation, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made when desired as fall within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The combination of a jack having a 1'0- tary operating element, and an operating attachment for said element, said attachment including a frame adapted to be supported at one end on the said element and on the ground or other surface at the other end,

and a power-multiplying gearing mounted on the frame and operatively connected With the said element.

2. The combination of a jack inclrfiling a laterally extending rotaryl operating element, with an operating attachment for the said element, said attachment including a frame, a shaft on the frame having adetachable connection with the said element, a

gearing carried hr the frame and having one part connected with the shaft and including another part to which power is adapted to means-4 jack, a gearing connected With theshaft and through which power is applied to the latter, and a supporting roller mounted on the frame at a point remote from the said shaft.

JAMES L. DOWNS.

Goaies of this atent me" be obtained for five cents each h addressing the Commissioner of Patents Washington, D. C. 

